Overview of Namura Piston Ring - 83mm Bore - NA-40005R

Namura rings replace the ones included with Namura piston assemblies; and they also match the OEM design for use on the original pistons unless noted

Rings are sold in a set for one piston

HOW TO ORDER:All Namura piston and ring sizes are indicated by the suffix number/letters. The PART NO. is completed by adding the letter(s) and/or numbers to the end, indicating the exact size needed - standard, fractional or incremental oversize ( no cylinder boring or sleeving involved) or regular oversizes, which require boring or sleeving of the cylinder, depending on the material

bought this ring set for my 98 Yamaha wolverine 350. spent all most 3 hours installing the cylinder, than figured out that the middle ring was over sized, had to grind the gap on the ring so it would fit in the cylinder. so before you install your piston into the cylinder, test fit the rings in the cylinder before installing onto the piston.